Unit installation

IOMM ACZ/AGZ-3 ACZ / AGZ-BM 95
Automatic Adjusted Ranges
The following are setpoints that are limited based on the option selected.
Table 52, Low Ambient Lockout Temperature
VFD Range
VFD = N
35 – 60°F
VFD = Y
-2 – 60°F
Table 53, Forced Fan 1,2,3
Number of fans Range
4 1 – 2 fans
6 1 – 3 fans
8 1 – 4 fans
Table 54, Forced Fan Stage Defaults
Number of Fans Setpoint
4 6 8
Forced Fan 1 1 1 1
Forced Fan 2 1 1 2
Forced Fan 3 2 2 3
When the number of fans setting is changed, the forced fan setpoints will default to values as shown
in the above table.
Shutdown Alarms
Shutdown alarms (also know as “Stop Alarms” or “Safeties”) execute rapid compressor shutdown
and require manual reset. They are also logged in the Alarm Log.
The following table identifies each shutdown alarm, gives the condition that causes the alarm to
occur, and states the action taken because of the alarm. If the alarm is auto-clearing, the reset
condition is shown below. Otherwise, the alarm is manually reset, requiring the operator to clear the
alarm. All shutdown alarms do the following while active:
Appear in the active alarm menu Light the alarm signal on the controller
Activate the alarm output NO1 Log the alarm in the Alarm Log.
Table 55, Shutdown Alarms
Description Occurs When: Action Taken Reset
No Evaporator Flow
Evap Fan State = RUN AND Evap Flow Digital
Input = No Flow for time > Evap Flow Proof SP
Rapid Stop Unit Manual
Low Evaporator
Pressure
Evaporator Press < Low Evap Pressure SP for time >
Low Evap Pressure Delay SP
Rapid Stop
Circuit
Manual
High Condenser
Pressure
Condenser Press > High Condenser Pressure SP
Rapid Stop
Circuit
Manual
Mechanical High
Condenser
Pressure/Motor
Protect
Digital Input = Off
On Power Up: Delay 150 Sec. before checking
Rapid Stop
Circuit
Manual
Phase Voltage
Protection (opt.)
If Phase Voltage Protection = Y, Then
Digital Input Off= Phase/Voltage Problem
Rapid Stop
Circuit
Phase/Voltage
Input returns to
normal
Ground Fault
Protection (opt.)
If Phase Voltage Protection = Y, Then
Digital Input Off= Phase/Voltage Problem
Rapid Stop
Circuit
Manual
Low Ambient Re-Start
Fault
Failed low ambient start for third consecutive time
Rapid Stop
Circuit
Manual
Evaporator Pressure
Sensor Fault
Sensor shorted or open
Rapid Stop
Circuit
Manual
Condenser Pressure
Sensor Fault
Sensor shorted or open
Rapid Stop
Circuit
Manual
Outside Ambient
Temp. Sensor Fault
Sensor shorted or open
Normal Stop
Unit
Manual